1
Download PLC_2_Unity_Referenc..
Transcript
System Objects System Bit Introduction General The Modicon M340, Premium, Atrium and Quantum PLCs use %Si system bits which indicate the state of the PLC, or they can be used to control how it operates. These bits can be tested in the user program to detect any functional development requiring a set processing procedure. Some of these bits must be reset to their initial or normal state by the program. However, the system bits that are reset to their initial or normal state by the system must not be reset by the program or by the terminal. 35006144 07/2011 149
